World's Most Evil Killers säsong 1

An examination of the notorious Steve Wright, a serial killer who became known as the 'Suffolk Strangler' after he brutally murdered five women during the final few months of 2006.

An examination of the serial killer Peter Sutcliffe, who became known as 'The Yorkshire Ripper' for a notorious reign of terror between 1975 and 1980 that claimed the lives of 13 women.

Ian Huntley murdered two 10-year-old schoolgirls in a case that shocked the nation and changed the course of British policing.

Between them, Fred and Rose West killed at least 12 girls over two decades in Gloucestershire. What fuelled their appetite for murder?

Levi Bellfield was already in prison for killing two women when he was found guilty of murdering schoolgirl Milly Dowler in 2002.

The first woman in British history to be given a whole life sentence, Joanna Dennehy's 2013 rampage saw her murder three men and attack two more.

A chilling look at Stephen Griffiths, who in 2009 viciously murdered three women, one in blatant view of a CCTV camera.

A look at the north London serial killer Dennis Nilsen, who murdered at least 12 men before being caught when he began flushing remains down the toilet.

When Tia Sharp disappeared, Stuart Hazell helped police search for her. But in reality he'd murdered the 12-year-old schoolgirl.

When Peter Tobin was convicted for raping and murdering a Polish student in 2006, further investigation linked him to two more murders.

In 1987, Michael Ryan went on a killing spree in Hungerford, Berkshire. By the time he turned the gun on himself, 16 people has been murdered.

Nurse Beverley Allitt poisoned 13 children under her care, killing four of them, earning her the nickname `The Angel of Death' from the British media.